Planooraph co



H. M. LOOMER.

GRINDING MACHINE. APPLICATION HLED ntc. 1|. i916.

Patented July 1, 1919.

lNOTON. n. ::v

IA Puma UNITED STATES PATENT OFFICE.

HENRY M. LOOMER, OF BEVERLY, MASSACHUSETTS, ASSIGNOB, BY MESNE ASSIGN- MENTS, TO UNITED SHOE MACHINERY CORPORATION, OF PA'IEBSON, NEW JERSEY, A CORPORATION 013 NEW JERSEY.

GRINDING-MACHINE.

Application filed December 11, 1916. Serial No. 136,223.

To all whom it may concern:

Be it known that I, HENRY M. LooMnR, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Grinding-Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to a machine of general utility for grinding or sharpening the teeth of rotary forepart or shankeutters such as are used in trimming the edges of boot and shoe soles in the process of manufacture, and is more especially concerned with a machine construction and arrangement which is of particular utility for grinding rotary cutters, the teeth of which are ground at .an angle to the axis of the cutter.

One form of rotary cutter of this general type is disclosed in Latham Patent No. 1,104,910 of July 28, 1914, and consists of a circular head having a plurality of teeth arranged in circumferential series with the front face of each tooth lying in a plane tangent to the surface of a cone extending co-axially through the cutter with its base at the larger end of the cutter and with the cutting edge of each tooth comprising portions lying at different radial distances from the axis of the cutter. The front faces of these teeth must be ground to sharpen the cutting edges of the head and must be properly positioned and held relatively to the grinder in order to secure satisfactory results.

One feature of my invention consists in the combination of a grindin Wheel, a cutter carrying member guide for straight line reciprocating movement, toward and from the grinding wheel, and a cutter holder connected to said member for universal adjustment'relatively to and about the longitudinal axis of said member.

This construction enables the cutter holder to be adjusted to that angle to the axis of the spindle which will position the face of a tooth of the cutter parallel with the side face of a grinding wheel under all conditions of inclination of cutter teeth facesand Specification of Letters Patent.

Patented July 1, 1919.

of grinder faces. The tooth can, therefore, be positioned at the proper angle for uniform engagement with the grinder face While the carrying member is reciprocated to draw the tooth face across the face of the grinding wheel.

A further feature of the invention consists in the combination of a grinding Wheel, a cutter carrying member, means for supporting and guiding said member for straight line movement toward and from the grinding wheel, a cutter holder carried by and angularly adjustable with respect to the longitudinal axis of said member and having a bearing to receive and journal a rotary cutter head for turning adjustment to present the faces of successive teeth to the active face of the grinding wheel and means normally tending to position said carrying member at one extreme of its straight line movement.

The relation of the carrying member and grinding wheel permits the cutter head to be drawn across the grinding Wheel at such an angle that at the point of maximum contact, the face of the wheel will on age substantially the entire surface of tie tooth face to be ground, the angular adjustment. of the cutter holder being such that the line of movement of the holder and spindle brings the tooth face uniformly against the grindin face of the Wheel.

In or or to secure the most effective grinding action, it is desirable that the cutter be determinately positioned with the faces of its teeth at the point of maximum surface contact with the grinder. An additional feature of the invention, accordingly, consists in an adjustable stop to arrest movement of the spindle with the cutter tooth in the position of maximum grinding surface contact.

A further feature of the invention consists in the combination with a carrying member having cutter holding means there- 011, means to support'and guide the carrying member for straight line reciprocating movement toward and from a grinding wheel, of a spring normally operative to position the cutter-carrying member at one extremity of its straight line movement. The spring in cooperation with the guiding means is utilized normally to position the cutter holder and c utter above its position of contact with the grinding wheel and to return it to such position after it has been manually moved downwardly to grinder contacting position and the pressure subsequently removed.

The guiding means in the GOIlSfillCtiOn shown provides a uniform line of movement for the spindle by guiding it vertically and holding it against axial turning movement so that the operator need only hold the face of a cutter tooth against the grinding face and move the spindle to traverse the wheel face with the cutter tooth.

Another fe'ature of the invention consists in the combination of a frame, a grinding wliee'l supported by the frame, an arm conneeted to the frame and adjustable toward and from the grifiding Wheel, a cutter hold ing spindie, and detachable interlocking plii g and socket connections between said spindle a d the arm of the grinding Wheel frame. e detachable interlocking plug and socket cdnnection in the present instance, a baydnet joii'it,facilitate the connection and disconnection of the grin'der attachnietlt, so that the -same grinding Wheel with its 'fi'aine and bracket arm may have a plurality of attachments.

These and other features "of the invention will be clearly seen from the following detailed specific-mien read in connection with the accompanying drawings, in vvhich Figui'e 1 is a perspective view of a grinding tnedhanism embodying the present invention;

Fig. 2is a vertical section on an enlarged scale througih the cutter hollding'spindle and its iding means; and

Fig. 3 is afragr'nentary top plan view of the cutter holder, critter and grinding Wheel in codperaiiive grinding-position.

The easement the subject-matter of theinventidnis'onethat ma be advantageou s ly em ioyea in wmbinsnen with a standard former grime-"and frame, such as a grinding Wheel '2 mounted on a rotary shaft iwhidh is jourha le d in ahead 6 sup ported from-the base '8 "by an upstanding yoke. The shaft may be rotated by means of the usnal driving; pulley. A In}; "10 offset from 'thefi'a'ine has one end of the bracket arm 12 pivtitally secured thereto by means of the usual bolt 14 and Wing nut 16. This arm, adjacent to its other end, is formed with an'eilohgated slot l8,through which tends a clampin bdlt 22 depending from a second bracket e m 20 Which is clamped in adjusted position on the arm 12 and relatively to the slot 18 by means of the wing mit 24 ehgagingthe e'nd ofthe bolt 22 below arm 12. One end of arm 20 is provided with a depending sleeve 26 rigidly secured to the arm and 'havin adjacent to its lower end an interhalpin 1 ,sospss IA cutter support and guide ma be do tachably secured to the arm 20 by what may be termed a plug and socket connection, In the present instance, a sleeve 30, provided intermediate its ends "with a supporting hang 32, and at its lower edge with a bayd net slot 34 is inserted into the depending sleeve 2-6 from above. its bayonet slot cooperating with the pin 28 to provide a bayonet joint lock, so that the sleeve 30 is plugged into the socket formed by the depending sleeve 26 and is locked in that relation by the bayonet joint with its flange 32 resting upon the upper-surface of the arm 20.

The sleeve 30 acts as a base or, support for cutter supporting and guiding means and at a point above the 'arm 20, is formed with n longitudi rra l slot through which a plate 36 extends into the interior of the sleeve and is rigidly secured thereto by pins or other suitable means. This :plate is pro ided with a laterally offset ponllion 38 having a depending tongue 40 spaced from the edge of the arm 20 to clear the arm. This lateral offset extends through aflonigitudinal slot 42 in a sup doting sleeve 44 Mid is rigid'ly secured to '0 is sleeveby suitable pins-or rivets.

The up'perend of the sleeve is enlarged in diameter to provide an annular shoulder ferminge seat forthe lowerend of a coiled spring 46 whose u-pperenu abuts agttinst'the upper lend of a socket formed in e -cnttercarrying member or spindle 48 mounted a nd guided upon the sleeve 44-for vertical sliding movement and guided for sflrwi ght lti ne movement by means of an elongated vertical slot 50, Whose sides bear upon *the sides'of the ofl'set plate 38.

The upper end of the =Spind=le above the abutment point for the spring 46, is hollowed and split to provide complements] sections, dn'e of when, seen best at 49, in Fig. 2, is bodily removable, cu ped recesses bein farmed at diametrically opposite points si t the upper ends of 'the fixed and removable sections to tprevide meanings for the spherieel *lower end 4340f asteei depending from "a cutter su pport'rngplaste 56.

This *p'late'is arranged to "be adjusted an gularly relatively to the aXis of the spindle 4'8 b clam ing the s herical end- 54 or i s depending stem in the socket 'ezitermed in the split upper end of the spindle. Ashortldere 'c'lairn ingscrew -58 has a smooth hearinginthe r movablesectienfltl and is thread-- ed info the opposite side of the fixed sec men, so that manipulation of the finger piece 60 of the screw operates'to clamp the L 'wer'ena of the stem ofehe cfl-tttfiholdihg p'late in the socket abt the upper end of the spindle with the plate and ilhe supported cutter positioned at the desired angle 'relhtively to the axis o fthe spindle.

The upper face df the plate 56 is preferably flat and is provided with a pin 62 upstanding substantially perpendicularly therefrom, and with a clearance notch 64 in one edge to permit the grinding wheel, whose edge face should be relatively narrow, to extend therein to substantially the bases of the cutter teeth. The diameter of the pin 62 corresponds with the diameter of the bore of rotary cutters of the type previously referred to, so that a rotary cutter such as shown at 66, may be seated on the plate 56 and over its pin 62 and may be turned by hand about the pin to present the faces of successive cutter teeth to the grinding wheel.

Manifestly, the arm 20 is positioned on the arm 12, and the latter is arranged at that angle to the grinding wheel frame to permit movement of the cutter carrying spindle 48 in a line toward and from the grinding wheel 2. The coiled spring 46 operates normally to elevate the spindle 48 so as to position the cutter 66 at a point above its posi tion of contact with the grinding wheel, the cutter holding plate 56 being adjusted angularly relatively to the longitudinal axis of the spindle 48, so as to bring the face of the tooth to be ground uniformly against the flat face of the grinding wheel, as suggested in Figs. 2 and 3 of the drawings. The proper position of the cutter holding plate may be determined by depressing the spindle L8 and swinging the cutter holding plate until the face of a cutting tooth on the cutter uniformly engages the side of the grinding wheel with substantially the entire face of the tooth in contact with the face of the grinding wheel.

It is desirable determinately to position the cutter with the face of its cutting teeth in maximum surface contact with the face of the grinding wheel, and, accordingly, an abutment ring 68 is mounted upon the spindle 48 and is adjustably secured thereto by a set screw. This set screw may be loosened when the cutter holding plate is adjusted as described and when the adjustment and maximum surface contact is secured, the set screw may be tightened. The ring will drop by gravity to rest upon the upper edge ofthe ofl'set plate 38, so that once the angle and maximum surface contact of the cutter tooth is secured, the operator may maintain the position of the cutter with one hand, and tighten the clamping screw 58 and set screw 70 with the other.

The operation of the device in grinding the cutter should be obvious from the foregoin and need not be further explained in detal The operator, after making the necessary adjustments as described, merely depresses the spindle 48 against the action of the spring-16, grasping the'cutter 66 at opposite sides with the thumb and forefinger and pressing the face of the tooth to be ground against the side of the grinder as the cutter traverses the edge of the grinding wheel. The compressed spring 46 acts to return the spindle for a second reciprocation, the operator maintaining the face of the tooth against the face of the grinding wheel as the spindle moves downwardly and upwardly. When the face of one tooth has been sufficiently ground, the cutter is merely rotated on the pin 62 to bring the face of the next adjacent tooth against the grinding Wheel and the opera tion is repeated. If it is desired to use the grinding wheel to grind other types of cutters, the sleeve 30 with the attached spindle, cutter holder and cutter may be removed bodily from the arm 20 by turning the sleeve 30 to release the bayonet lock.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. A device of the class described having, in combination a grinding wheel, a carrying member guided for straight line reciprocating movement toward and from the grinding wheel and a cutter holder having a connection with said carrying member for universal adj ustmenirelatively to and about {She longitudinal axis of the carrying memer.

2. A device of the class described having, in combination, a grinding wheel, a carrying member for a rotary cutter guided for straight line reciprocating movement in the general direction of the axis of the cutter toward and from the grinding wheel, a cutter holder carried by and angularly adjustable relatively to the axis of the carrying member and arranged to receive and journal the cutter for turning movement, and means normally effective to position said member at one extreme of its straight line movement.

3. A device of the class described having, in combination, a grinding wheel, a carrying member, mounted for reciprocation toward and from the grinding wheel, a cutter holder having a connection with one end of said carrying member for universal adjustment of the holder relatively to and about the longitudinal axis of the carrying member and having a bearing to support a rotary cutter for turning movement, and a support for said carrying member having a plurality of guiding members extending substantially parallel to each other and arranged to guide said carrying member and cutter for straight line movement.

4. A device of the class described having, in combination, a hollow spindle, a cutter holder having a connection with one end of the spindle for universal angular adjustment of the holder relatively to the longitudinal axis of the spindle, a supporting bracket, and connections from said bracket to said spindle including a guide rod seated withuus dih l low sp ndle ande second and parallel guide mem er c op ra ng with th spindle to maintain it against axial tunning movement ,and to guide it for straight line movement.

5. (suindiug mechan sm comp sing a frame, a gninding Wheel thereon, a carrying member, .means oonncoted to the fI'BJ'UBR Hd arranged to support and guide said I-IIBXTL' her for straight line reciprocating ,inove ment toward and from the grinding wheel, and a cutter holder carried by said member and mounted iior ;a,ngular adjustment relatively to the longitudinal axis of said member and having a hearing to receive and journal a rotary cutter head for turning movement to present the faces of suwessive teeth to the active face of the grinding: wheel.

6. Grinding mechanism comprising a frame, a grinding wheel. thereon, an arm connected ,to vthe frame, a carrying member, means detachabl y oonneetod to the arm and cooperating with said inenrber to Support and guide said member for straight line reciprocating movement toward and from the grinding Wheel, and a cutter holder oonnooted to one end of said .Inemher for universal angular adjustment relatively to the longitudinal axis of said member and having a hearingto receive and journal a, rotary cutter fiorturning movement to present the faces of v-sueo seine teeth to the ,active face of the grinding Wheel.

7. Grinding mechanism comprising a grinding wheel, eicaurying member mounted for straight line .izecipiiooating movement toward and fromithe periphery of the gninding wheel, \a cutter holder carried by and singularly adj ustahle with respect to the longitudinal axis of the carrying member to position the faces of teeth of a supported cutter tor engagement with the grinding wheel, an aiiljueteble stop to arrest straight line movement of the carrying mem'ber ;in.one direction with a cutter t th in the position of imes mum g z nding surface centuot,

8,. Grinding mechanism comprisingl va grinding wheel, a spindle, a cutter h der carried by one end of the spindle for angle lar adjustment relatiuel-y to the axis of the spindle, means to support and guide the spindle for straight line reciprocating moveerit toward .and from the peri hery oi the grinding wheel, and a stop member adgusta ly c r ed. by th VS indle n ag aid supporting and gui mg means to arrest movement ofvaxoutter on the holder wlhh its teeth ,in ,the position of maximum grinding suefa'oe contest.

9. A device of the cdass descmbed ha ng, in combination, a grinding ;Wh eel a member guided for ventical reclprogait n movement toward and from thegrindm g v lweh a t-eutter hol er wnnee ed to sa d member fo angular adjustment relatively to the longi tudinal ems of said imm berhud having a bearing to support the cutter for turning movement, and means normally effective .to position said member with the cutter thereon above its position ofioontac wi thegrind mg Wheel. I

I 10. Adeviceof the class deseribedhavin-g, in combination, a grinding .Wheel, .a spindie guided for vertical reciprocating moneinent toward and from the grinding wheel a cutter holder ooimected to the upper end of said spindle for a ular adjustment reletl ely to thelongitudmel axis of the spindle and having ,a bearing .to support the cutter for turning adjustment, and means normally tending to position the spindle at the upper extremity of its vertical movement and With the cutter above its position of contact with the grinding Wheel.

11. A device ifor ,grindizng cutters provided with axial openings having, in oombination, a spindle having means arra ed to enter a cutter opening and about which said cutter is freely rotatable by the operator, means to support andguicle the spin (lie for straight line nefiiprocating movement, and a spring normally operative to position said spindle at one extremity of i s straight line movement.

12. Grinding mechanism comprising a grinding wheel, a hollow spindle having cutter holding means at one end, ,ineansrextending within the spindle to support and guide said spindle for straight line movement in a path substantially tangential to the grinding wheel, ,andia spring operating against said spindle end normally efi'ective to position its cutter holding end out of Contact with the grinding wheel.

13. A device ,oLtheelesS descnibedihaving, in combination, a frame; a finding Wheel mounted on efimme, a low spi dl mounted for reeiprooatiugvmovement toward and from the grmdiiing wh elia di fii fi cu er holder one end ig: iade ustmimt angu W11 U ect ito .t on.- gitudinal axis of the Pilf-flfld having a longitudinally extending guide slot, an arm onnectedto the frame, spindlesup orting and guiding means eon na l d gt it .e arm lnclu mg a rod seating in-the hollow sp ndle and a rigidl attached plate e tending radially outwar through therguidfi said spindle, and a spr'iqig operating be tween saidv rod and spind e and normally efieotive to ,os1ticm the c tt r t dmgi n of,the splndih beyond, the act ve face 'of-the grindmgwheel.

14,. trmd1ng mechanism harm? on 0 me mn, a rw ei igmndmg. w' ee vnacmui ed on :freme an am iconnecte to the frame and adlustable towardand-fro n the slot, in-

gr nding: wheel, .a ut r h lding, shing es,

and means detachably connecting said spindle and arm by interlocking plug and socket connections.

15.. Grinding mechanism having, in combination, a frame, a grinding wheel mounted on the frame, an arm connected to the frame and adjustable toward and from the grinding wheel, a spindle having cutter holding means at one end, means to support and guide said spindle for movement toward and from the grinding wheel, and a bayonet joint connection between said supporting and guiding means and said arm.

16. In a grinding machine, the combination of a spindle, and a cutter holder secured to said spindle for angular adjustment relatively to the axis of the spindle and having a fiat-surfaced base with an upstanding pin fixed therein to receive and journal a cutter to rotate about said pin.

17. In a grinding machine, the combination of a spindle mounted to move longi tudinally of its axis and a cutter holder carried by said spindle, with ball and socket connections between the spindle and holder efi'ective angularly to adjust the holder rela tive to the longitudinal axis of the spindle.

18. In a grinding machine, the combination of a spindle having a sectional socketed end, and a cutter holder having a substantially spherical end adjustably clamped in said socketed spindle end and having a flat surfaced base with an upstanding fixed pin to receive and rotatably retain a cutter.

Copies of this patent may be obtained for five cents each, by addressing the 19. In a grinding machine, a cutter holder having a cutter supporting plate with an up standing cutter receiving pin and a grinder entrance notch in one edge and having a depending substantially spherical base.

20. In a grinding machine, the combination of a grinding wheel, a spindle mounted for movement toward and from the grinding wheel, a cutter holder connected to said spindle for angular adjustment laterally with respect to its longitudinal axis and having a cutter supportin surface extending transversely to the direction of mov ment of the spindle.

21. In a grinding machine, the combination of a grinding wheel, a cutter carrying member mounted for reciprocating movement toward and from the periphery of said wheel, and a cutter holder connected to one end of said member for angular adjustment laterally with respect to the line of reciprocating movement of said member and having a cutter supporting plate extending transversely to the direction of reciprocating movement of said member.

22. A cutter grinding machine comprising a grinding wheel, a supporting member adjustable toward and from the wheel, a cutter carrier, and interlocking means for detachably connecting the supporting member and carrier.

In testimony whereof I have signed my name to this specification.

HENRY M. LOOMER.

Commissioner of Patents,

Washington, 11. c. 

